Update Tests

Author: veera-sivarajan

tests/codegen/issues/issue-128709-format-without-args.rs

@@ -0,0 +1,17 @@
+//@ compile-flags: -C no-prepopulate-passes -C opt-level=0
+
+#![crate_type = "lib"]
+
+// String formating macros without any arguments should compile
+// to a `memcpy` followed by a call to `std::io::stdio::_print`.
+
+#[no_mangle]
+pub fn code() {
+    // CHECK-LABEL: @code
+    // CHECK-NOT: getelementptr
+    // CHECK-NOT: store
+    // CHECK-NOT: ; call core::fmt::Arguments::new_const
+    // CHECK: call void @llvm.memcpy
+    // CHECK-NEXT: ; call std::io::stdio::_print
+    println!("hello world");
+}

tests/ui/consts/const-format-arguments.rs

@@ -0,0 +1,5 @@
+
+pub fn main() {
+    const A: std::fmt::Arguments = std::fmt::Arguments::new_const(&[&"hola"]);
+    //~^ use of unstable library feature
+}

tests/ui/consts/const-format-arguments.stderr

@@ -0,0 +1,20 @@
+error[E0658]: use of unstable library feature 'fmt_internals'
+  --> $DIR/const-format-arguments.rs:3:36
+   |
+LL |     const A: std::fmt::Arguments = std::fmt::Arguments::new_const(&[&"hola"]);
+   |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add `#![feature(fmt_internals)]` to the crate attributes to enable
+   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
+
+error: `Arguments::<'a>::new_const` is not yet stable as a const fn
+  --> $DIR/const-format-arguments.rs:3:36
+   |
+LL |     const A: std::fmt::Arguments = std::fmt::Arguments::new_const(&[&"hola"]);
+   |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = help: add `#![feature(const_fmt_arguments_new)]` to the crate attributes to enable
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0658`.